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Engine-Codes – Generic – B1694

B1694 Code - Autolamp On Circuit Open

Quick Answer

The B1694 diagnostic trouble code (DTC) indicates that there is an open circuit in the autolamp system of the vehicle. Common causes include Damaged wiring in the autolamp circuit, Faulty autolamp control module, Malfunctioning light sensor. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
B1694 indicates Autolamp On Circuit Open.
Common causes
Common causes include Damaged wiring in the autolamp circuit, Faulty autolamp control module, Malfunctioning light sensor.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 17, 2024
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Code B1694 Description

The B1694 diagnostic trouble code (DTC) indicates that there is an open circuit in the autolamp system of the vehicle. The autolamp system is responsible for automatically turning on the vehicle's headlights when it detects low light conditions. When this circuit is open, it means that there is a break in the electrical connection, preventing the autolamp system from functioning properly.

OBDII Code B1694 - Autolamp On Circuit Open
B1694 Code - Autolamp On Circuit Open

Common Causes of B1694

  1. Damaged wiring in the autolamp circuit.
  2. Faulty autolamp control module.
  3. Malfunctioning light sensor.
  4. Blown headlight bulb.
  5. Corrosion in the electrical connections.

Symptoms of B1694

  1. Headlights not turning on automatically in low light conditions.
  2. Inconsistent autolamp operation.
  3. Dashboard warning light indicating autolamp system malfunction.
  4. Dim or flickering headlights.

How to Fix B1694

  1. Begin by visually inspecting the wiring harness for any visible damage or breaks. Repair or replace any damaged wires.
  2. Test the autolamp control module using a multimeter to check for proper voltage and continuity. Replace the module if necessary.
  3. Check the light sensor for proper operation and alignment. Clean or replace the sensor as needed.
  4. Inspect the headlight bulbs for any signs of damage or wear. Replace any blown bulbs.
  5. Clear the DTC with a diagnostic scanner after completing the repairs and test the autolamp system to ensure proper functionality.

Cost to Fix B1694

The cost of repairing a B1694 DTC can vary depending on the specific cause of the issue and the labor rates in your area. On average, the parts for this repair, including a new autolamp control module and light sensor, can range from $100 to $300. Labor costs can add an additional $100 to $200, bringing the total repair cost to approximately $200 to $500. It is important to note that these are rough estimates, and actual costs may vary based on the vehicle make and model, as well as the shop's labor rates. Be sure to consult with a qualified mechanic for a more accurate cost estimate.

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Code B1694 Information for Specific Makes

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B1694 Code

1. What does the OBDII code B1694 mean?

Code B1694 indicates an open circuit in the autolamp on circuit, which is part of the system that controls the automatic headlights.

2. What are the common symptoms of code B1694?

Symptoms include automatic headlights not turning on, headlights staying on longer than expected, or a warning light on the dashboard.

3. What causes the B1694 code to appear?

Common causes include damaged wiring or connectors, a faulty autolamp sensor, or a malfunctioning headlight switch.

4. How can I diagnose code B1694?

Start by inspecting the wiring and connectors in the autolamp circuit for damage or corrosion. Then test the autolamp sensor and headlight switch for proper functionality.

5. Can I still drive my car with code B1694 active?

Yes, you can drive the car, but the automatic headlight feature may not work, which could reduce visibility or safety in low-light conditions.

6. How do I fix the B1694 code?

Repairs may involve replacing damaged wiring, cleaning or reconnecting corroded connectors, or replacing a faulty autolamp sensor or headlight switch.

7. How much does it cost to fix code B1694?

The repair cost varies depending on the issue, ranging from $50 for minor wiring repairs to $200 or more for sensor or switch replacements.

8. Can a blown fuse cause code B1694?

Yes, a blown fuse in the headlight or autolamp circuit can cause the code, so fuses should be checked during diagnostics.

9. Is the B1694 code specific to certain car brands?

While it can appear on various makes and models, it is more common in vehicles with advanced automatic headlight systems.

10. Can I reset code B1694 without fixing the issue?

Clearing the code without addressing the root cause may temporarily remove the warning, but the problem will likely return.

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